Cover plate assembly and battery cell

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and a battery cell, the cover plate assembly comprises a cover plate, an anti-explosion valve, a lower insulating part and a shielding member, the anti-explosion valve is mounted on the cover plate, and the inner side and the outer side of the cover plate can be communicated through the anti-explosion valve; the lower insulating part is mounted on the inner side of the cover plate, and an exhaust through hole corresponding to the anti-explosion valve is formed in the lower insulating part; and the shielding component is mounted on the lower insulating part, can shield at least part of the exhaust through holes at least in the first preset direction, and is used for preventing at least part of electrolyte from impacting the explosion-proof valve through the exhaust through holes. Therefore, the shielding component is additionally arranged, so that at least part of the exhaust through holes in the lower insulating part can be shielded at least in the thickness direction of the cover plate, at least part of electrolyte can be prevented from impacting the explosion-proof valve through the exhaust through holes, and the effect of protecting the explosion-proof valve is achieved; and the problems that the explosion-proof valve is damaged, the battery cell leaks liquid, the explosion-proof valve is opened in advance and the like are effectively avoided.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a cover plate assembly and a battery cell. Background Art

[0002] like Figures 1 to 3 As shown, the blade battery cell generally includes a shell, a pole group, an end plate 4' and a cover structure. The pole group is installed in the shell, the cover structure is sealed at the opening of the shell, and the end plate 4' is installed between the cover structure and the end of the pole group. The cover structure generally includes a plain aluminum plate 1', a lower plastic 2' and an explosion-proof valve 3' and other structures. The explosion-proof valve 3' is installed on the plain aluminum plate 1', and the explosion-proof valve 3' is connected to the inner and outer sides of the plain aluminum plate. The lower plastic 2' is formed with an exhaust groove and an exhaust through hole corresponding to the explosion-proof valve 3'. Correspondingly, the end plate 4' forms an exhaust cavity. It can be seen that a cavity is formed between the explosion-proof valve 3' and the end plate 4'. When the explosion-proof valve 3' is located at the bottom, the electrolyte will gather in the cavity. When the battery cell is shaken, the electrolyte will shake back and forth, continuously impacting the explosion-proof valve 3', causing the explosion-proof valve 3' to be damaged, the battery cell to leak, and the explosion-proof valve 3' to open prematurely. Utility Model Content

[0003] The purpose of the present application is to provide a cover plate assembly and a battery cell, which to a certain extent solves the problem in the prior art that a cavity is formed between the inner end plate at the bottom of the battery cell and the explosion-proof valve. When the explosion-proof valve on the blade battery cell cover plate is located at the bottom, the electrolyte will gather in the cavity. As the battery cell shakes, the electrolyte continuously impacts the explosion-proof valve, causing damage to the explosion-proof valve, leakage of the battery cell, and premature opening of the explosion-proof valve.

[0004] The present application provides a cover plate assembly, comprising: a cover plate, an explosion-proof valve, a lower insulating member, and a shielding member; wherein the explosion-proof valve is installed on the cover plate, and along a first preset direction, the inner side and the outer side of the cover plate can be connected via the explosion-proof valve; the lower insulating member is installed on the inner side of the cover plate, and the lower insulating member is formed with an exhaust through hole corresponding to the explosion-proof valve;

[0005] The shielding member is mounted on the lower insulating member, and the shielding member can shield at least a portion of the exhaust through hole at least along the first preset direction, so as to prevent at least a portion of the electrolyte from impacting the explosion-proof valve through the exhaust through hole.

[0006] In the above technical solution, further, the shielding member is arranged on a side of the lower insulating member facing away from the cover plate.

[0007] In any of the above technical solutions, further, the lower insulating member is formed with a mounting protrusion protruding toward a side away from the cover plate, and the mounting protrusion is arranged along the outer periphery of the exhaust through hole;

[0008] The mounting protrusion is formed with a mounting opening, the shielding member is formed with an auxiliary mounting portion, and the auxiliary mounting portion is mounted within the mounting opening.

[0009] In any of the above technical solutions, further, the number of the mounting openings is two, and they are respectively disposed on opposite sides of the exhaust through-hole. The number of the auxiliary mounting portions is two, and they correspond to the two mounting openings one by one.

[0010] In any of the above technical solutions, further, along the first preset direction, the distance between the shielding member and the explosion-proof valve is t, and t≥0.5mm.

[0011] In any of the above technical solutions, further, the shielding member and the lower insulating member are connected by an adhesive means.

[0012] In any of the above technical solutions, further, along the first preset direction, the shielding member is formed with an exhaust notch penetrating through both of its sides.

[0013] In any of the above technical solutions, further, along the second preset direction, exhaust notches are formed on both opposite sides of the shielding member.

[0014] In any of the above technical solutions, further, the material of the shielding member is epoxy resin, metal or plastic.

[0015] The present application further provides an electric core, including a housing, an electrode assembly, an end plate, and the cover plate assembly according to any of the above technical solutions. Wherein, the electrode assembly is mounted within the housing, the cover plate assembly seals the opening end of the housing, the end plate is disposed between the electrode assembly and the cover plate assembly, and the end plate is formed with an exhaust cavity and an auxiliary exhaust through-hole communicating with the exhaust cavity. The exhaust cavity corresponds to the exhaust through-hole of the lower insulating member. Therefore, all the beneficial technical effects of the cover plate assembly are achieved, and will not be elaborated herein.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] In the cover plate assembly provided by the present application, a shielding member is added, which can at least shield at least part of the structure of the exhaust through-hole on the lower insulating member along at least the thickness direction of the cover plate, and further can block at least part of the electrolyte from impacting the explosion-proof valve through the exhaust through-hole, thereby playing a role in protecting the explosion-proof valve, effectively avoiding problems such as damage to the explosion-proof valve, leakage of the electric core, and premature opening of the explosion-proof valve, and improving the safety and reliability of the electric core. Description of the Drawings

[0018] To more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0019] Figure 1 It is a schematic structural diagram of a cover plate assembly of a blade battery cell in the prior art;

[0020] Figure 2 is Figure 1 a partially enlarged structural diagram of;

[0021] Figure 3 It is a partial cross-sectional view of a blade battery cell in the prior art;

[0022] Figure 4 It is an exploded view of the cover plate assembly in the embodiment of the present application;

[0023] Figure 5 It is another exploded view of the cover plate assembly in the embodiment of the present application;

[0024] Figure 6 It is a schematic structural diagram of the shielding member in the embodiment of the present application;

[0025] Figure 7 It is a schematic structural diagram of the lower insulating member in the embodiment of the present application.

[0026] Reference numerals:

[0027] 1'-light aluminum plate, 2'-lower plastic, 3'-explosion-proof valve, 4'-end plate, 5'-electrolyte;

[0028] 1-cover plate, 2-explosion-proof valve, 3-lower insulating member, 31-exhaust groove, 32-exhaust through hole, 33-mounting projection, 331-mounting opening, 4-shielding member, 41-assistive mounting portion, 42-exhaust notch, 5-end plate, 51-exhaust cavity, 52-assistive exhaust through hole, 6-explosion-proof valve patch. Specific embodiments

[0029] The following will clearly and completely describe the technical solutions of the present application with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0030] Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0031] Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this application.

[0032] In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0033] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific situations.

[0034] Next, refer to Figures 4 to 7 Describe a cover plate assembly and an electric core according to some embodiments of this application.

[0035] Embodiment 1

[0036] Refer to Figure 4 and Figure 5 As shown, the embodiments of this application provide a cover plate assembly, including: a cover plate 1, an explosion-proof valve 2, a lower insulating member 3, and a shielding member 4; wherein, the explosion-proof valve 2 is installed on the cover plate 1, and along a first preset direction, the inner side and the outer side of the cover plate 1 can be connected through the explosion-proof valve 2, and preferably, the first preset direction is the thickness direction of the cover plate 1, and this will also be used as an example for description hereinafter, of course, it is not limited thereto; the lower insulating member 3 is installed on the inner side of the explosion-proof valve 2 along its thickness direction, and the lower insulating member 3 is formed with an exhaust through-hole 32 corresponding to the explosion-proof valve 2, and preferably, along the thickness direction of the cover plate 1, this exhaust through-hole 32 is disposed opposite to the explosion-proof valve 2, of course, it is not limited thereto, and some structures can also be staggered, etc.;

[0037] The shielding member 4 is installed on the lower insulating member 3, and the shielding member 4 can at least shield at least part of the exhaust through-hole 32 along the thickness direction of the cover plate 1, so as to block at least part of the electrolyte from impacting the explosion-proof valve 2 through the exhaust through-hole 32.

[0038] According to the structure described above, in the cover plate assembly provided by the present application, a shielding member 4 is added, which can shield at least part of the structure of the exhaust through hole 32 on the lower insulating member 3 at least along the thickness direction of the cover plate 1, thereby blocking at least part of the electrolyte from impacting the explosion-proof valve 2 through the exhaust through hole 32, playing a role in protecting the explosion-proof valve 2, effectively avoiding problems such as damage to the explosion-proof valve 2, leakage of the battery core liquid, and premature opening of the explosion-proof valve 2, and improving the safety and reliability of the battery core.

[0039] It should be noted that: along the thickness direction of the cover plate 1, the shielding member 4 can shield part of the exhaust through hole 32 or all of the exhaust through hole 32, which is specifically designed according to actual needs.

[0040] In addition, the inner side of the cover plate 1 refers to the side of the cover plate 1 close to the battery core, and the outer side of the cover plate 1 refers to the side of the cover plate 1 away from the battery core, that is, the side exposed to the housing of the battery core.

[0041] In addition, the cover plate assembly provided by the present application can be applied to blade battery cores or square shell battery cores, etc., which is specifically selected according to actual needs.

[0042] In this embodiment, preferably, as Figure 4 and Figure 5 shown, the shielding member 4 is arranged on the side of the lower insulating member 3 facing away from the cover plate 1.

[0043] According to the structure described above, the shielding member 4 is installed on the side of the lower insulating member 3 facing away from the cover plate 1, that is, the shielding member 4 is not arranged between the cover plate 1 and the lower insulating member 3, so as to ensure that the assembly surface of the lower insulating member 3 and the cover plate 1 is flat and has no protrusions, improving the assembly accuracy and efficiency.

[0044] It should be noted that: it is not limited to arranging the shielding member 4 on the side of the lower insulating member 3 facing away from the cover plate 1, and it can also be arranged on the side of the lower insulating member 3 close to the cover plate 1, that is, the shielding member 4 is arranged between the cover plate 1 and the lower insulating member 3, which is specifically designed according to actual needs.

[0045] In this embodiment, preferably, as Figure 4 and Figure 7 shown, the lower insulating member 3 is formed with a mounting protrusion 33 protruding toward the side facing away from the cover plate 1, and the mounting protrusion 33 is arranged along the outer periphery of the exhaust through hole 32; the mounting protrusion 33 is formed with a mounting opening 331, the shielding member 4 is formed with an auxiliary mounting portion 41, and the auxiliary mounting portion 41 is mounted in the mounting opening 331.

[0046] According to the structure described above, installing the installation part of the shielding member 4 in the installation opening 331 of the installation protrusion 33 around the exhaust through-hole 32 plays a role in supporting and positioning, making the shielding member 4 and the lower insulating member 3 assembled more firmly and stably, and not easily displaced etc.

[0047] In this embodiment, preferably, as Figure 6 and Figure 7 shown, the number of the installation openings 331 is two, and they are respectively arranged on the opposite sides of the exhaust through-hole 32. The number of the auxiliary installation parts 41 is two, and they correspond to the two installation openings 331 one by one.

[0048] According to the structure described above, two auxiliary installation parts 41 are designed on both sides of the shielding member 4, and the two auxiliary installation parts 41 can be installed in the corresponding two installation openings 331 at the same time, improving the supporting and positioning effects.

[0049] It should be noted that: the number of the auxiliary installation parts 41 and the installation openings 331 is not limited to two above, and can also be one, which is specifically designed according to actual needs.

[0050] In addition, in this embodiment, preferably, the positioning protrusion is an annular structure extending along the outer periphery of the exhaust through-hole 32. Of course, it is not limited to this. The positioning protrusion can also be a strip-shaped structure extending along the length direction of the exhaust through-hole 32. When the number of the installation openings 331 is one, the number of the installation protrusions 33 is one. When the number of the installation openings 331 is two, the number of the installation protrusions 33 is two. Of course, this is only an example, and it can also be designed according to actual needs.

[0051] In this embodiment, preferably, as Figure 5 shown, along the thickness direction of the cover plate 1, the distance between the shielding member 4 and the explosion-proof valve 2 is t, and t≥0.5mm.

[0052] According to the structure described above, a certain gap is formed between the shielding member 4 and the explosion-proof valve 2, so as to prevent damage to the explosion-proof valve 2 during assembly.

[0053] Of course, along the thickness direction of the cover plate 1, the range of the distance t between the shielding member 4 and the explosion-proof valve 2 is not limited to the above, and can also be set according to actual needs.

[0054] In this embodiment, preferably, the shielding member 4 and the lower insulating member 3 are connected by an adhesive method.

[0055] According to the structure described above, the shielding member 4 and the lower insulating member 3 are further bonded together, making the shielding member 4 and the lower insulating member 3 assembled more firmly and stably.

[0056] It should be noted that: The shielding member 4 can also be only fitted with the mounting opening 331 on the lower insulating member 3 through the auxiliary mounting portion 41 thereon, without further fixing by gluing, and is specifically designed according to actual needs.

[0057] In this embodiment, preferably, as Figure 6 shown, along the thickness direction of the cover plate 1, the shielding member 4 is formed with an exhaust gap 42 penetrating through both of its sides.

[0058] According to the structure described above, when the battery cell undergoes thermal runaway, the exhaust gap 42 on the shielding member 4 can be used for normal exhaust, avoiding the blockage of the exhaust channel, and improving safety and reliability.

[0059] In this embodiment, preferably, as Figure 6 shown, along the length direction of the explosion-proof valve 2, exhaust gaps 42 are formed on both opposite sides of the shielding member 4.

[0060] According to the structure described above, exhaust gaps 42 are opened on both sides of the shielding member 4, increasing the exhaust channel and improving the exhaust effect during thermal runaway.

[0061] Further, preferably, the second preset direction is the length direction of the explosion-proof valve 2, and this will also be taken as an example for description hereinafter. Of course, it is not limited thereto. For example: The second preset direction can also be the width direction of the explosion-proof valve 2, etc.

[0062] Further, preferably, a plurality of exhaust channels are provided on each of the opposite sides of the shielding member 4, and the plurality of exhaust channels are arranged along the width direction of the explosion-proof valve 2.

[0063] Further, preferably, the explosion-proof valve 2 is waist-shaped. Along the width direction of the explosion-proof valve 2, auxiliary mounting portions 41 are provided on both sides of the shielding member 4, and along the length direction of the explosion-proof valve 2, exhaust gaps 42 are provided on both sides of the shielding member 4. It can be seen that the auxiliary mounting portions 41 and the exhaust gaps 42 are arranged on different side portions of the shielding member 4, making full use of the space without interference, and the layout is more reasonable. In addition, along the length direction of the explosion-proof valve 2, the exhaust area is larger. Therefore, along the length direction of the explosion-proof valve 2, exhaust gaps 42 are provided on both sides of the shielding member 4 to improve the exhaust effect. Of course, it is not limited thereto. The auxiliary mounting portions 41 and the exhaust gaps 42 can also be arranged on the same side portion of the shielding member 4, or the auxiliary mounting portions 41 can be arranged on one side of the exhaust member along the length direction of the explosion-proof valve 2, and the exhaust gaps 42 can be arranged on one side of the exhaust member along the width direction of the explosion-proof valve 2, etc., which are specifically designed according to actual needs. Moreover, the shape of the explosion-proof valve 2 is not limited to the waist shape and can also be other shapes. When the explosion-proof valve 2 is of other shapes, the positions and numbers of the exhaust gaps 42 and the auxiliary mounting portions 41 on the shielding member 4 can be reasonably designed.

[0064] In this embodiment, preferably, the material of the shielding member 4 is epoxy resin, metal or plastic such as PP, PET or PE, etc., and is specifically designed according to actual needs.

[0065] In this embodiment, preferably, as Figure 6 shown, the shielding member 4 is in the shape of a rectangular plate, which has a regular shape while meeting the shielding requirements and is convenient for processing and manufacturing. Of course, the shape of the shielding member 4 is not limited to this, and it can also be other shapes such as cross-shaped, I-shaped or circular, etc., and is specifically designed according to actual needs.

[0066] In this embodiment, preferably, as Figure 4 and Figure 7 shown, the lower insulating member 3 is formed with an exhaust groove 31, and the bottom of the exhaust groove 31 is formed with the aforementioned exhaust through hole 32. Of course, it is not limited to this, and the exhaust groove 31 may not be provided, and the exhaust through hole 32 may be directly opened, and is specifically designed according to actual needs.

[0067] In this embodiment, preferably, as Figure 4 shown, the present cover plate assembly further includes an explosion-proof valve patch 6, and the explosion-proof valve patch 6 is pasted on the side of the cover plate 1 away from the lower insulating member 3, which plays a role in protecting the explosion-proof valve 2.

[0068] It should be noted that: the cover plate 1 can be made of light aluminum plate, and the lower insulating member 3 can be made of plastic, that is, a lower plastic is formed. Of course, the materials of the cover plate 1 and the lower insulating member 3 are not limited to the above, and can also be selected according to actual needs.

[0069] In addition, in this embodiment, the length direction of the explosion-proof valve 2, the length direction of the lower insulating member 3 and the length direction of the cover plate 1 are the same. Of course, it is not limited to this, and can also be designed according to actual needs.

[0070] Embodiment Two

[0071] Embodiment Two of the present application further provides a battery cell, including the cover plate assembly of the above Embodiment One. Therefore, it has all the beneficial technical effects of this cover plate assembly, and the same technical features and beneficial effects will not be repeated.

[0072] In this embodiment, preferably, as Figure 4 shown, the battery cell further includes a housing, a pole group and an end plate 5; wherein, the pole group is installed in the housing, and the cover plate assembly seals the opening end of the housing, which plays a role in closing the opening of the housing;

[0073] The end plate 5 is disposed between the electrode group and the cover plate assembly. The end plate 5 is formed with an exhaust cavity 51 and an auxiliary exhaust through hole 52 communicating with the exhaust cavity 51. The exhaust cavity 51 corresponds to the exhaust through hole 32 of the lower insulating member 3 and is used for exhausting gas during thermal runaway. It can be seen that the end plate 5 plays a role in supporting the cover plate 1, protecting the electrode group, and forming an exhaust channel.

[0074] Further, preferably, along the thickness direction of the cover plate 1, the exhaust cavity 51 is disposed opposite to the exhaust through hole 32 of the lower insulating member 3. The electrolyte accumulated in the exhaust cavity 51 will impact the explosion-proof valve 2 when shaken. In this application, a shielding member 4 is disposed at the position corresponding to the exhaust through hole 32. Then, the shielding member 4 blocks most of the liquid in the exhaust cavity 51 from impacting the explosion-proof valve 2 through the exhaust through hole 32. Of course, part of the structures of the exhaust cavity 51 and the exhaust through hole 32 of the lower insulating member 3 may also be staggered, and it is designed according to actual needs.

[0075] It should be noted that the housing may be formed with an open end, and the aforementioned cover plate assembly may be installed at this open end. The housing may also be formed with two open ends, and at least one of the two open ends is installed with the aforementioned cover plate assembly, which is designed according to actual needs.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate, an explosion-proof valve, a lower insulating member and a shielding member; wherein the explosion-proof valve is installed on the cover plate, and along a first preset direction, the inner side and the outer side of the cover plate can be communicated through the explosion-proof valve; the lower insulating member is installed on the inner side of the cover plate, and the lower insulating member is formed with an exhaust through hole corresponding to the explosion-proof valve; The shielding member is mounted on the lower insulating member, and the shielding member can shield at least a portion of the exhaust through hole at least along the first preset direction, so as to prevent at least a portion of the electrolyte from impacting the explosion-proof valve through the exhaust through hole.

2. The cover plate assembly according to claim 1, characterized in that: The shielding member is arranged on a side of the lower insulating member facing away from the cover plate.

3. The cover plate assembly according to claim 2, characterized in that: The lower insulating member is formed with a mounting protrusion protruding toward a side away from the cover plate, and the mounting protrusion is arranged along the outer periphery of the exhaust through hole; The mounting protrusion is formed with a mounting opening, the shielding member is formed with an auxiliary mounting portion, and the auxiliary mounting portion is mounted in the mounting opening.

4. The cover plate assembly according to claim 3, characterized in that: There are two mounting openings, which are respectively arranged on two opposite sides of the exhaust through hole. There are two auxiliary mounting parts, which correspond one to one to the two mounting openings.

5. The cover plate assembly according to claim 1, characterized in that: Along the first preset direction, the distance between the shielding member and the explosion-proof valve is t, and t≥0.5 mm.

6. The cover plate assembly according to claim 1, characterized in that: The shielding member is connected to the lower insulating member by gluing.

7. The cover plate assembly according to claim 1, characterized in that: Along the first preset direction, the shielding member is formed with exhaust gaps penetrating through two sides thereof.

8. The cover plate assembly according to claim 7, characterized in that: Along the second preset direction, the exhaust gaps are formed on two opposite sides of the shielding member.

9. The cover plate assembly according to any one of claims 1 to 8, characterized in that: The shielding component is made of epoxy resin, metal or plastic.

10. A battery cell, characterized in that: It comprises a shell, a pole group, an end plate and a cover plate assembly as described in any one of claims 1 to 9; wherein the pole group is installed in the shell, the cover plate assembly is sealed on the open end of the shell, the end plate is arranged between the pole group and the cover plate assembly, and the end plate is formed with an exhaust cavity and an auxiliary exhaust through hole connected to the exhaust cavity, and the exhaust cavity corresponds to the exhaust through hole of the lower insulating member.

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